App Engine Documentation PHP Flexible Environment Documentation APIs & Reference API Google Cloud Platform API for PHP (External) A client library that embraces idioms of PHP and provides high-level API abstractions so that you can easily access Google Cloud Platform services. Glossary App Engine Glossary Definitions of App Engine-specific terms and concepts. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates.